Even before the games, Pokémon with gender differences have made occasional appearances in the anime, with a pink Butterfree being one of the first to appear in Bye Bye Butterfree. What follows is a chronological list of Pokémon with gender differences that have appeared in the anime.

Other examples

Physical

Butterfree made her appearance in Bye Bye Butterfree. Ash's Butterfree fell in love and attempted to woo her with a courtship dance. Despite this, the pink Butterfree was not impressed by his attempts and rejected him. She eventually changed her mind when Ash's Butterfree saved her from Team Rocket, choosing him to be her mate.